Steam-generator.



'No. 7|2,405.' Patented Oct. 28. I902.

w. E. PEARSON.

STEAM GENERATOR.

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No. 7I2,40 5. Patented-Oct. 28, I902.

. W. E. PEARSON.

STEAM GENERATOR.

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w. 51 PEARSON. STEAM GENERATOR.

(Application filed my a, 1901;)

(No Model.) 4 Sheets-Sheet 4.

' i k/ENTE THE norms PrrERs 4:0 Puo'roumoq WASHINGTON. u. c.

UNITED STATES PATENT OFFICE.

WILLIAM E. PEARSON, OF BOSTON, MASSACHUSETTS.

STEAM-GENERATOR.

SPECIFICATION formingpart of Letters Patent No. 712,405, dated October 28, 1902.

Application sea May a. 1901 Serial No. 59,028. on model.)

To aZZ whom it may concern:

Be it known that 1, WILLIAM E. PEARSON, of Boston, in the county of Suifolk and State of Massachusetts, have invented a new and useful Improvement in Steam-Generators, of which the following, taken in connection with the accompanying drawings,isa specification.

My invention relates to that class of steamgenerating boilers in which it is required to produce comparatively large quantities of steam from small boilers and to produce the same quickly. Heretofore boilers of this class have proved unsatisfactory, for the reason that in use the rapid generation of steam was almost sure to interfere with the circulation of the water, and thus prevent the further generation of steam as well as to cause parts of the boilers to become hot and liable to cause trouble and even explode. The object of my invention is to overcome these defects. My improved boiler is illustrated in the ac companying drawings, in which-- Figure l is a front elevation of my boiler, including the feed-water heater. Fig. 2 is a horizontal section taken on line 2 2 of Fig. 1. Fig. 3 is a side elevation of my boiler and feed-water heaters. Fig. 4: is a rear elevation of the same. Fig. 5 is a diagrammatical sketch to illustrate the flow of water in the generator. In this sketch the parts R R R (shown in Fig. 3) are omitted, as they do not affect the principle of action of my apparatus.

The central feature of my generator consists in its having two separated tanks B and B, one above the other. These tanks have no direct interior connection with each other.

They are, in fact, two distinct tanks separated from each other by a clear space S. (Shown in Fig. 3.) Water is fed into the lower tank B from the feed-water heaters H H through the pipes F F F F and F Water is returned to the tank B through the pipe R R, as will be explained hereinafter.

The two tanks B and B are indirectly connected .interiorly by means of the manifold tube A, the series of pipes P P P P, and the manifold tube A. The series of pipes P P P P are arranged as coils (see Figs. 1 and 2) and act as. conveyers as well as heaters. The heated water from the tank B flows upward through the manifold A and the coils of pipes to the manifold A and thence to the upper tank B, from which it passes through the pipes B B and B to the steamliherators B B The parts of the liberators that are above the water-level (see Fig. 1) act as steam-domes, from which the steam passes through the pipes S S S to the engine.

The inflow of water may be briefly traced as follows: From the feed-pump or reservoir of water under pressure the water passes through the pipe F to the feed-water heaters H H, thence through the pipes F F F F F F to the lower tank B, thence through the manifold A and the coil series P P P P and manifold A to the upper tank B, from which it flows through the pipes B B B into the liberators B B". As the heated water makes steam its temperature is lowered, and it will have a tendency to pass to the lowest part of the apparatusthat is, return. I will now describe the return part of my apparatus. The water having lost its high temperature by the act of generating steam will have a higher specific gravity and will seek a lower level, displacing the water in the lower parts.

This it does by flowing downward through the pipes R, R R, and R to the upper header-tube R thence through the uprights R R to the lowerheader-tube R, thence through the pipes R check-valve R and pipe R to the lower tank B, thus causing a constant circulation throughout the entire apparatus.

The apparatus is covered by a metallic casing, which also includes the furnace or heatgenerators. In some cases I prefer to have the headers R R and the uprights R R outside of the metalliccasing.

I have not shown any means for generating heat, as I do not wish to confine myself to any particular fuel or method of generating heat. This apparatus is especially adapted to heat-generators in which oil is used as a fuel.

I claim 1. In a steam-generator; an upper and lower tank, one placed above the other and without direct interior connection; coils of pipes surrounding the said tanks, the lowerends of the said pipes being connected with the lower tank and their upper ends with the upper tank, substantially as and for the purpose set forth.

nected with said tanks; a system of returnpipes, having a check-valve therein, adapted to receive Water from the liberators and return it to the lower tank through said checkvalve, substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in the presence of r two subscribing witnesses, on this 9th day of April, A. D. 1901.

WILLIAM E. PEARSON.

Witnesses:

FRANK G. PARKER, JOHN BUCKLER. 

